A postalcode (known in various countries as a post code, postcode, or ZIP code) is a series of letters and/or digits appended to a postal address for the purpose of sorting mail.
Postal services often have their own distinctive formats and placement rules for postalcodes (service areas, as a rule, are defined by national borders).
Between 1990 and 1993 the old 4 digit postalcodes in the former West Germany were prefixed with the letter "W", and postalcodes in the former East, with "O" (for "Ost" or "East" in German).
This codelist is an essential reference tool for those dealing with MARC records, for systems reporting library holdings, for many interlibrary loan systems, and for those who may be organizing cooperative projects on a regional, national, or international scale.
Although use of obsolete codes is permitted in the MARC records, their use in newly-created records is discouraged, as obsolete codes are often non-unique or in some way less desirable than the valid codes for organizations.
For Canada, the subunit for the country is followed by a subunit representing the province, and a third subunit which represents the city or town.
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